Your question about SiemensS30810-Q2209-X DDCL

The DDCL (Double Data Communication Link) for Hicom 300/300E, provides the signaling interface between the LTUs and the DP in the SWU.

It functions as a fan-in/fan-out unit for up to 9 signaling paths (8 LTUs and 1 SIUCO).

The front panel of the board caontains a 7-segment display and a reset key.